Pinking machine



Sept. 14, H337. Uss 2,093,071

PINKING MACHINE Filed Sept. 16, 1935 2 Sheets-Sheet 1 INVENTOR (/14 C08e/wssa L ATTORNE Sept. 14, 1937. I J. BRussELL. 2,093,071

PINKING MACHINE :Filed Sept. 16, 1935 2 Sheets-Sheet 2 INVENTOR dA 608BRUJSEZ;

Patented Sept. 14, 1937 PATENT OFFICE PIN KIN G MACHINE Jacob Brussell,New York, N. Y., assignor to Isadore Friedman, Roselle, N. J.

Application September 16, 1935, Serial No. 40,751 5 Claims. (Cl.112-122) My invention relates to pinking machines, and in more detail,to pinking machine attachments for sewing machines, which attachementsare operated either through gears from the arm of the sewing machine, ordirectly from the needle bar.

My present invention is an improvement on the invention described in myapplication; Serial Number 27,910, series of 1935, filed June 22, 1935and the machine described in my patent, Number 2,010,216, issued August6, 1935, in that the machine cuts by shearing and not by punching, thuspreventing wear on the cutting edges and faces and decreasing the shockof the action of the machine.

An object of my invention is to produce a shearing pinking machine whichwill act on the principle of a scissors.

Another object is to produce a pinking attachment for a sewing machinewhich can be used as a straight edge cutting attachment by reversing thetwo cutting blades.

Another object is to produce a simple, lightpinking attachment which canbe mounted on the plate of the sewing machine and receive its powerdirectly from the needle bar, thus obviating the cutting away of anyportion of the arm casing and the use of gears on the sewing machineparts.

Another object is to produce a pinking attachment for a sewing machinewith a multiple number of teeth covering an appreciable cutting width sothat one descent of the cutting blade is equivalent to severalrevolutions of the stitch making parts.

I accomplish these and other objects by constructing on a suitably cutreversible shearing plate a suitably cut reversible knife blade pivotedat one end to the shearing plate and providing means at the other endfor attaching either to the arm or the needle bar of the sewing machine.

Further and more specific objects, features and advantages will moreclearly appear from the detailed description given below taken inconnection with the accompanying sheets of drawings which form a part ofthis specification.

Figure 1 is a side view of my pinker attached to a sewing machine withpart of the sewing machine and the base of the pinker partially cutaway. Figure 2 is a perspective assembly of one form of the cuttingparts of my pinker. Figure 3 is a plan view of one form of my pinker,removed from the sewing machine. Figure 4 is a front View of one form ofpinker with the knife opening 24 to receive the endofthe bolt bladesreversed and, in aposition for straight cutting. Figure 5 is a sideelevation of one form of pinker. Figure 6 is a front view of a pinkerattached to the needle bar of a sewing machine with the blade raised andin a position for pinkll'lg.

My pinking machine I is mounted on the sewing machine base 2 to theright of the needle bar 3 of the sewing machine (rest of sewing machinenot shown). In general, my pinker shown in Fig. 1 is similar to the onesdescribed in my above mentioned application and patent and has a base 4on which the bearing 5 and spring post 411 are mounted. Pivoted in thebearing 5 isthe arm 6 ending in the forked pin joint- 1. Intermediatethe bearing Sand joint 7 is the driving 'arm connection 8 throughwhichpower is derived to manipulate the pinker. Between the arm 8 and thebearing 5 on the arm 6 is the spring mechanism 9 which provides thenecessary compression in the pinker. The base 2 of the sewing machine iscut away and the base 4 of the pinker is provided with the. opening 9ain I order to receive the cutting element I 0. The front of the pinkeris provided with the shear plate ll against which the cutting elementoperates.

The cutting element [0, shown in perspective assembly in Fig. 2, isassembled in Fig. 1 and comprises the forked holder l2, the knife partI3 and the screw and washers M which hold the knife part, firmly inposition against the forked holder I2. The forked holder l2 at its upperpart is narrow and provided with the opening l5 to permit thebolt [6 topass therethrough and form a pin connection in the joint 1. The lowerpart of the holder 12 is forked and provided with the opening I], whilethe rear of the holder is provided with, the extended bent arm I8 androller I 9.

The knife element I3 is provided with the teeth 20 at the front and withthe rear plate 2| for fitting into the opening I! in the holder. Theplate 2 is also threaded to receive the bolt H. To the rear ,of theteeth 20 a cutting edge 22 is provided. This edge extends above theplate 2|. The edge 22 is straight and provides for straightv cuttingwhile the teeth 20 provide for pinking, and to use the cutting elementfor straight cutting, the knifeelement is reversed, the front'be- 0coming the back. To do this, the space 23 is clearedof teeth andprovided with a threaded M. The lower end of the knife element isconstructed similar to the upper end in order that these ends rectly towhich'is attached the shear plate 42.

element theupward extending spring can be reversed and so provide fortwo pinking cutting faces and two straight cutting edges. To one side ofthe teeth is provided the upper and lower extended piece which acts as aguide as hereinafter described.

The cutting element l I against which the knife i3 shears is constructedin two parts, the arms 26 which are fixed to the base of the pinker andthe shearing edge piece 21. The edge piece 21 is screwed to the arms 25by the screws 28 and is reversible. The piece 2] is provided with thecutting edge 29 at the front for straight cutting and with theindentures at the rear for pinking with the knife element I3. To thesides of the indentures 35 the straight edge 3! extends so that theextension 25 of the knifeelement can rest against it as the knifereciprocates in and out of the shear plate and prevents the spring fromforcing the knife forward out of its proper position when the cuttingparts are above the shear plate. When the element 93 is in' a posi tionfor pinking with the teeth 24 to the front, the shear plate is mountedso that the indentures 30 are to the rear to co-act with the teeth, andwhen the cutting edge 22 of the element 43 is to the front, the edge 25of the shear plate is to the rear to co-act therewith. In order thatboth the edges 22 for cutting and the teeth 28 for pinking can shear thegoods to be out instead of punching, the edge 22 and the face of theteeth slope upwards to the left on both the under and upper parts of theknife element, thus causing the cut ting edges and pinking parts of theknife element and shear plate to come into contact consecutively aswould the parts of blades of a pair of shears.

The necessary compression to force the cutting parts into close contactis provided by the spring mechanism v9 againstone branch 32 of thepivoted arm 33 so that the other branch 34 of the arm presses againstthe roller I9 of the arm l8. The arm 33 is pivoted at about its midpoint into the spring post 4a..

The description previously given relates mainly to Figs. 1 and 2 and thepinker described deals principally with the same pinker mentioned in theprevious application but differs therefrom in the knife,,its holder. andthe shearing plate, and provides forstraight cutting as well as pinkingand for shearing instead of punching.

The modification shown in Figs. 3, 4 and 5 provides for a pinker inwhich the arm pivoted to the shear plate itself carries the knife.

In' Fig. 4, the pinker shown, or. the part shown, can be attached eitherby having the arm connection 46 joined to the sewing machine direct-,

ly or to the forked pin joint 1 of Fig.1. In the drawings shown in Fig.6, the pinker is joined dithe needle bar of the sewing machine, thuseliminating cutting away parts of the sewing machine casing, supplyingextra gears and many extra pinker parts.

The pinker shown in these modifications is constructed with a base plate4| to the front of The base plate 4| can be either fixed directly to thesewing machine or as shown in Fig. 5, attached to the base 4 of thepinker shownin Fig. 1. The base plate is providedwith an upwardprojecting part 43 on the left and with the upward extending spring 44on the right. The part 43 has pivoted in its upper part the arm 45 bythe nutand bolt 45. The arm 45 extends across the shear plate andcarries midway between its ends the knife element 41 andto the right ofthe, knife 44 presses been described, but

' desire to cover.

against the arm so as to force the knife element 4? into close contactwith the shearing plate. At the end of the arm 45 removed from the pivot45 is the pin joint 48 which connects the pinker by the arm 49 and joint50 to the extension 5| which passes through the lower end of the armconnection 5. If the pinker is to be joined to the sewing machinedirectly, as shown in Fig. 6, the arm 45 is provided with the slot andthe curved arm 52 is provided, the lower end of which carries a pin 54passing through the slot 55 of the arm 45 and the upper end carries thecollar 53 which clamps onto the needle bar, so as to cause the arm 46 toreciprocate together with the needle bar. Thus, the one end of the arm46 being pivoted at 45 and the other end reciprocating, the knife 4!travels in the path of an are about the pivotal center 45. The knife 41is constructed with the teeth 55 curved in the form of an arc the centerbeing the pivotal point 45 so that all points in'each tooth areequi-distant from the center. The indentures 5'? in the shear plate aresimilarly oppositely constructed and use the same center so that thereis always a perfect contact between the teeth and the indentures intowhich they fit. On the knife 4'5, to the rear of the teeth, is thecutting edge 59 against which the edge 58 can cut when the knife andshear plate are reversed.

By constructing the two co-operating cutting parts 'on pieces pivotedtogether and having the pivot 45 above the line of contact of thecutting parts, the action of cutting becomes one of shearing and theoperation is similar to that of a pair of scissors. v V

In the knife blades and shearing plates, two or three teeth andindentures are shown and provide for cutting over a wide'space withonestroke of the cutting element. as the goods travels slowly under theneedle in comparison to the amount cut in one stroke, the cuttingmachine may be geared or fixed to the driving mechanism of the machinein such a manner that the cutting mechanism reciprocates' at a higherratio than normally in pinking machines, as for instance, one to four,and so makes fewer revolutions and travels slower.

It is to be noticed'that the pinking mechanism shown in Fig. 1 is fixedon the sewing machine in a line perpendicular to the line of sewing andr the reciprocating parts travel on this line, and the center aboutwhich the reciprocatingparts move is also on this same line through theneedle.

vTo compensate for this,

However, in Fig. 6 and the modification shown in Figs. 3, 4, and 5 themachines are placed on a line parallel to the line of sewing and to theright of this line. The'knife is placed on'the rotating arm in thedirection of rotation which is the line of the machine. In this way,the'edge of the knife travels in an are which is in the plane of therotating parts of the pinker, while in the pinker shown in Fig. 1, theknife edge is perpendicular to the line of rotation of the moving parts.This alignment of the knife edge with v the direction of the movingparts helps produce the shearing in the machine and tends to eliminatethe sudden shock of the cutting edge against the cloth.

Although several modifications of .my invention are shown in thedrawings and described, many changes and forms are possible which havenot which still come within the of thisQinvention and which I Therefore,all forms and embodiments coming within the language and scope spiritand scope of any one or more of the claim as my invention.

I claim:

1. A pinking device for a sewing machine having a shear plate, a carrierarm pivoted to the shear plate, an arm slidably connected to the carrierarm at one end and firmly connected to the needle bar of the sewingmachine at the other end, a knife element positioned on the carrier armfor co-acting with the shear plate to cut, and a spring mounted on theshear plate and co-acting with the carrier arm to force the knifeelement against the shear plate.

2. A pinking device for a sewing machine having a shear plate havingindentures therein, a knife element having teeth thereon, pivoted to theshear plate, the indentures in the shear plate and the teeth on theknife element being curved and having the pivot of the knife element thecenter of the curve, and said teeth entering the indentures when theknife element is rotated about its pivot, and a driving means connectingsaid knife element to the sewing machine.

32-. A pinking device for a sewing machine having a shear plate havingindentures therein, a knife element having teeth thereon, pivoted to theshear plate, the indentures in the shear plate and the teeth on theknife element being curved and having the pivot of the knife element thecenter of the curve, and said teeth entering the indentures when theknife element is rotated about its pivot, and the pivot of the knifeelement being above the line of contact of the knife eleappended claims,I

ment and shear plate, a spring means forcing the knife element againstthe shear plate, and a driving means connecting said knife element tothe sewing machine.

4. A pinking device for a sewing machine capable of pinking or straightedge cutting having a base plate, a shear plate reversibly attached onthe base plate having indentures on one edge for pinking and a straightsharpened edge for cutting on the opposite edge to the indentured edge,a carrier arm pivoted on the base plate, a knife element reversiblyattached on the arm comprising a plate having teeth on one face and astraight sharpened edge on the opposite face, and said shear platedirectioned in relation to the knife element that the straight edge ofthe shear plate coacts with the straight edge of the knife element orthat the teeth of the knife element coact with the indentures of theshear plate, and spring means forcing the knife element against theshear plate and means connecting-the carrier arm to the sewing machineto derive motive power therefrom.

5. A reversible front to rear and top to bottom knife for a shearingpinking machine having a top face, a front face, said front face havingteeth extending to the top for pinking and said top face having astraight cutting edge to the rear for straight cutting when the knife isreversed and an under face similar to the top face and mounting meanspermitting reversing the knife, top tobottom and front to rear.

JACOB BRUSSELL.

